The initial, acute phase lasts for about two months after infection.
最初的急性期在感染之后持续约两个月。
A headache that lasts for 17 months is a problem. See a doctor.
持续了17个月的头疼那可是个事了，去看医生吧。
Observe period lasts for 3 months.
观察周期为3个月。
Our summer vacation lasts for nearly two months.
我们的暑假大约有两个月。
Our summer vacation lasts for nearly two months.
我们的暑假大约有两个月。
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